What is the working principle of lithium battery discharge?

The working principle of lithium battery discharge and what is the cut-off voltage? The lithium battery discharge termination voltage means that after the lithium battery is discharged to a certain voltage, it should not be continued to discharge, otherwise it will cause irreversible loss of part of the lithium battery's power, and severely damage the battery. The current nominal voltage of a single lithium battery is generally designed to be 3.7V, and the termination voltage is 2.75V. The working principle of the lithium battery discharge termination voltage The lithium battery discharge termination voltage is an important application parameter related to the service life of the lithium battery. The current nominal voltage of a single lithium battery is generally designed to be 3.7V, and the termination voltage is 2.75V. There are two situations that cause the manufacturer to increase the upper limit of the termination voltage to 3.0V. The first is the electrochemical properties determined by the lithium battery material, which is often From the perspective of safer use of batteries; the second is related to specific electrical products and electrical environment. Of course, there are also the opposite situations. The termination voltage can be designed to be lower, such as 2.5V and 2.4V, but there is no lower than 2.4V. If the working temperature during discharging is in the range of -20~60℃, the lithium battery with a termination voltage of 2.75V can actually continue to discharge, but it must not be lower than 2.5V. As mentioned earlier, it is between 2.75V and 2.5V. The loss between time may be partial, and the most serious damage will be caused below 2.5V, making the battery unusable. Lithium battery packs also have a termination voltage. This type of lithium battery pack is sometimes called a core lithium battery. The discharge termination voltage of a core lithium battery should not be less than 2.75×n (n is the number of batteries in series). The most commonly used 6-cell lithium battery for notebook computers Take the battery as an example. This kind of 6-cell lithium battery often uses a combination of 3 strings and 2 parallels. Therefore, the discharge cut-off voltage of this kind of lithium battery is 2.75V×3u003d8.25V, and the minimum in practice cannot be lower than 2.5V×3u003d7.5 V. In fact, because lithium batteries are relatively expensive, both single-cell lithium batteries and multi-cell lithium batteries are equipped with protection boards or protection ICs. When the battery voltage reaches the termination voltage, the battery will emit a certain amount of electricity through electrical appliances. Signal, the user should keep in mind the operation method. What is the discharge cut-off voltage of lithium batteries? Generally, a lithium battery has a working voltage of 3.7V and a termination voltage of 3.2V; a lithium iron phosphate battery has a working voltage of 3.26V and a termination voltage of 2.5V. The voltage at which a lithium battery is fully charged is called the termination charging voltage in the industry. According to the battery industry standard, the voltage is about 1.2 times the rated voltage. For example, for a 3.6V cell phone battery, the final charging voltage is 4.2~4.3V. The discharge end voltage of the lithium iron battery is basically around 3.3, and the discharge protection voltage setting of the internal protection board of the lithium battery is basically 2.5v. What is the appropriate setting for the termination voltage of the lithium battery? According to the termination voltage of 2.5 of the protection board, will it not affect the capacity performance of the lithium battery and will not damage the lithium battery. When a lithium battery is discharged, its working voltage always changes with the continuation of time. Use the working voltage of the battery as the ordinate, discharge time, or capacity, or state of charge (SOC), or depth of discharge (DOD) The curve drawn by drawing the abscissa is called the discharge curve. To understand the discharge characteristic curve of a battery, the voltage of the battery must first be understood in principle. The internal resistance of a lithium battery increases with the increase of the battery discharge current. This is mainly because the large discharge current makes the polarization trend of the battery increase, and the greater the discharge current, the more obvious the polarization trend. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous post: What are the differences between power lithium batteries and energy storage lithium iron phosphate batteries?